Overview: Microsoft Office versions 2602 and 2603 have introduced a significant performance regression that impacts Office.js-based add-ins, including Active. This is a Microsoft platform issue, not an Active software issue. Version 2512 and earlier are unaffected.
The below instructions will allow you rollback Microsoft Office to a build that doesn't have these performance regression.
Instructions
Version 2512 build number: Monthly Enterprise Channel Version 2512 is Build 19530.20260 Microsoft Learn (latest patched build of 2512).
For clients using Intune, the key Microsoft article is:
Manage M365 Apps updates via Intune Settings Catalog: https://learn.microsoft.com/en-us/intune/intune-service/configuration/settings-catalog-update-office — this walks through using the Settings Catalog to search for the Target Version setting and entering the version you want to pin to. Microsoft Learn
Change update channels for Microsoft 365 Apps: https://learn.microsoft.com/en-us/microsoft-365-apps/updates/change-update-channels — covers channel management via Intune, Group Policy, and ODT.
For clients without Intune (manual rollback), the official Microsoft support article is:
How to revert to an earlier version of Office: https://support.microsoft.com/en-us/topic/how-to-revert-to-an-earlier-version-of-office-2bd5c457-a9…
The manual steps are straightforward: download the Office Deployment Tool from the Microsoft Download Center, create a Configuration.xml file specifying the target version, and run the setup. Microsoft Support Alternatively, they can run this command from an elevated command prompt:
cd "%ProgramFiles%\Common Files\Microsoft Shared\ClickToRun"officec2rclient.exe /update user updatetoversion=16.0.19530.20260
Then disable automatic updates from any Office app via File > Account > Update Options > Disable Updates until a fix is released.